Most often in January, 30 days.
Highest follower count seen that year: 3,444.
January
Jan 1 00:00–02:00 Jan 2 02:00–05:00, 17:00–20:00 Jan 3 01:00–05:00, 18:00–21:00 Jan 4 02:00–05:00, 18:00–21:00 Jan 5 01:00–08:00 Jan 7 18:00–20:00 Jan 8 18:00–21:00 Jan 9 01:00–03:00, 16:00–19:00 Jan 10 02:00–03:00 Jan 11 00:00–03:00 Jan 12 23:00–24:00 Jan 13 00:00–04:00, 20:00–23:00 Jan 14 02:00–04:00, 19:00–23:00 Jan 15 00:00–03:00, 18:00–22:00 Jan 16 23:00–24:00 Jan 17 00:00–07:00, 16:00–20:00 Jan 18 04:00–08:00, 16:00–20:00 Jan 19 21:00–23:00 Jan 20 02:00–06:00, 15:00–19:00 Jan 21 02:00–07:00, 13:00–16:00 Jan 22 03:00–04:00, 21:00–23:00 Jan 23 02:00–05:00 Jan 24 18:00–21:00 Jan 25 01:00–08:00, 14:00–15:00 Jan 26 20:00–21:00 Jan 27 03:00–09:00, 15:00–17:00 Jan 28 18:00–21:00 Jan 29 01:00–05:00, 19:00–24:00 Jan 30 00:00–01:00, 16:00–21:00, 23:00–24:00 Jan 31 00:00–03:00, 18:00–20:00
February
Feb 2 03:00–07:00, 21:00–22:00 Feb 3 02:00–06:00, 18:00–21:00 Feb 4 02:00–06:00, 16:00–19:00 Feb 6 18:00–21:00 Feb 7 02:00–09:00 Feb 9 03:00–08:00 Feb 10 02:00–08:00 Feb 11 04:00–08:00, 21:00–22:00 Feb 12 01:00–08:00, 18:00–22:00 Feb 13 16:00–19:00, 21:00–22:00 Feb 14 00:00–04:00, 20:00–22:00 Feb 17 18:00–23:00 Feb 18 02:00–07:00, 17:00–19:00 Feb 19 02:00–07:00, 17:00–19:00 Feb 20 01:00–08:00, 20:00–22:00 Feb 21 02:00–08:00, 17:00–20:00 Feb 22 18:00–20:00 Feb 23 03:00–06:00 Feb 24 03:00–07:00, 17:00–19:00, 22:00–24:00 Feb 25 02:00–07:00, 18:00–22:00 Feb 26 04:00–07:00 Feb 27 03:00–06:00, 18:00–20:00 Feb 28 02:00–05:00, 23:00–24:00
March
Mar 1 00:00–09:00, 19:00–22:00 Mar 2 04:00–05:00, 19:00–22:00 Mar 3 03:00–05:00, 07:00–08:00, 20:00–22:00 Mar 4 03:00–09:00, 16:00–19:00 Mar 5 04:00–07:00 Mar 6 06:00–09:00 Mar 7 00:00–01:00 Mar 9 16:00–20:00, 23:00–24:00 Mar 10 03:00–07:00, 17:00–19:00 Mar 11 16:00–22:00 Mar 12 04:00–09:00, 17:00–19:00 Mar 13 03:00–09:00 Mar 14 01:00–10:00 Mar 15 03:00–09:00, 17:00–19:00 Mar 16 02:00–03:00, 19:00–22:00 Mar 18 03:00–07:00, 21:00–24:00 Mar 19 22:00–23:00 Mar 20 03:00–06:00, 17:00–18:00 Mar 21 02:00–07:00, 17:00–18:00, 22:00–24:00 Mar 22 00:00–09:00, 22:00–24:00 Mar 23 00:00–01:00, 21:00–22:00 Mar 24 20:00–24:00 Mar 25 23:00–24:00 Mar 26 00:00–04:00, 20:00–24:00 Mar 27 04:00–05:00, 22:00–24:00 Mar 28 00:00–09:00, 17:00–19:00 Mar 29 03:00–10:00 Mar 30 02:00–10:00 Mar 31 03:00–10:00
April
Apr 1 02:00–09:00 Apr 2 01:00–04:00 Apr 4 21:00–24:00 Apr 5 04:00–10:00 Apr 6 01:00–09:00 Apr 7 19:00–21:00 Apr 8 02:00–09:00 Apr 9 14:00–17:00, 23:00–24:00 Apr 10 03:00–09:00 Apr 11 03:00–09:00 Apr 12 01:00–09:00 Apr 13 05:00–09:00 Apr 14 01:00–09:00, 17:00–19:00 Apr 15 00:00–02:00, 22:00–23:00 Apr 16 00:00–09:00, 13:00–14:00 Apr 17 21:00–24:00 Apr 18 04:00–06:00, 16:00–20:00 Apr 19 23:00–24:00 Apr 20 00:00–03:00, 20:00–24:00 Apr 21 02:00–07:00, 17:00–19:00 Apr 22 03:00–08:00, 18:00–20:00 Apr 23 03:00–06:00, 17:00–18:00 Apr 24 00:00–04:00 Apr 25 01:00–08:00, 18:00–20:00 Apr 26 02:00–05:00, 19:00–21:00 Apr 27 02:00–07:00, 18:00–19:00 Apr 28 01:00–08:00, 17:00–20:00 Apr 29 01:00–07:00, 16:00–20:00 Apr 30 02:00–08:00, 17:00–23:00
May
May 1 16:00–17:00, 19:00–21:00 May 2 03:00–08:00 May 3 00:00–03:00, 21:00–22:00 May 4 06:00–08:00, 20:00–23:00 May 5 03:00–06:00, 19:00–20:00 May 6 01:00–04:00, 17:00–22:00 May 7 03:00–08:00, 20:00–21:00 May 8 02:00–03:00, 05:00–09:00, 17:00–20:00 May 9 04:00–08:00, 15:00–16:00 May 11 04:00–08:00, 18:00–20:00 May 12 19:00–23:00 May 13 13:00–21:00 May 14 22:00–23:00 May 15 02:00–08:00, 13:00–17:00 May 17 05:00–08:00, 18:00–19:00 May 18 13:00–19:00 May 20 17:00–21:00 May 21 02:00–08:00, 17:00–20:00 May 22 03:00–06:00, 18:00–20:00, 23:00–24:00 May 23 00:00–04:00, 21:00–24:00 May 24 20:00–21:00 May 25 19:00–22:00 May 26 18:00–20:00 May 27 21:00–24:00 May 28 00:00–02:00, 04:00–06:00, 19:00–22:00 May 29 02:00–07:00, 17:00–19:00 May 30 03:00–07:00, 20:00–23:00 May 31 03:00–07:00
June
Jun 1 00:00–01:00, 04:00–08:00, 20:00–23:00 Jun 2 03:00–08:00, 18:00–21:00 Jun 3 04:00–07:00, 18:00–22:00 Jun 4 03:00–05:00, 17:00–22:00 Jun 5 02:00–03:00, 05:00–06:00, 22:00–23:00 Jun 6 21:00–24:00 Jun 7 00:00–02:00, 21:00–23:00 Jun 8 05:00–09:00, 22:00–24:00 Jun 9 00:00–02:00, 20:00–24:00 Jun 10 03:00–05:00, 17:00–21:00 Jun 11 04:00–08:00, 18:00–22:00 Jun 12 03:00–09:00, 19:00–22:00 Jun 13 01:00–02:00 Jun 15 19:00–24:00 Jun 17 18:00–24:00 Jun 18 03:00–08:00, 18:00–20:00 Jun 19 03:00–08:00, 22:00–23:00 Jun 20 20:00–22:00 Jun 21 23:00–24:00 Jun 22 00:00–08:00, 20:00–23:00 Jun 23 05:00–08:00, 19:00–22:00 Jun 24 03:00–09:00 Jun 25 15:00–17:00, 19:00–20:00 Jun 26 03:00–07:00, 18:00–21:00 Jun 27 18:00–21:00 Jun 29 17:00–21:00 Jun 30 02:00–08:00, 18:00–19:00
July
Jul 1 02:00–08:00, 18:00–22:00 Jul 2 17:00–23:00 Jul 3 03:00–08:00, 17:00–19:00 Jul 4 01:00–02:00, 14:00–18:00 Jul 5 05:00–10:00, 12:00–15:00, 20:00–21:00 Jul 6 16:00–24:00 Jul 7 04:00–09:00 Jul 8 03:00–09:00, 19:00–21:00 Jul 9 23:00–24:00 Jul 10 00:00–01:00, 03:00–10:00, 19:00–23:00 Jul 11 10:00–15:00, 23:00–24:00 Jul 12 00:00–01:00, 23:00–24:00 Jul 13 00:00–03:00, 17:00–21:00 Jul 14 09:00–15:00 Jul 15 12:00–16:00, 23:00–24:00 Jul 16 05:00–08:00, 15:00–17:00, 20:00–23:00 Jul 17 22:00–23:00 Jul 18 00:00–01:00, 10:00–15:00 Jul 19 02:00–04:00 Jul 20 04:00–06:00, 08:00–13:00, 23:00–24:00 Jul 21 00:00–01:00, 11:00–15:00 Jul 22 01:00–04:00, 11:00–14:00, 20:00–21:00 Jul 23 02:00–05:00, 20:00–24:00 Jul 24 00:00–02:00, 05:00–09:00, 19:00–22:00 Jul 25 17:00–22:00 Jul 26 05:00–06:00 Jul 27 05:00–08:00